Join Date: Sep 2010
Location: Tabb, York County, Virginia
What you're talking about, where the pump stops way short, seems to be due to the fuel bouncing off the curvature of the inlet pipe and triggering the nozzle to stop. I found out that backing off the speed of delivery one notch, or pulling the nozzle out of the car a tad, seems to allow a normally full fill.
However, if you are bringing the fuel level right to the top of the inlet pipe, let me say that a few years ago, I read some info that said not to top up the tank because it'll overflow into the evaporative emission canister and choke up the charcoal that filters the fumes, then the canister would have to be replaced at some horrendous cost.
I quit topping up at the self-serve. When I'm in NJ where drivers aren't allowed to pump their own gas, I ask 'em not to top it off.